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| 玉米纹枯病周期性脉冲Logistic模型研究 | |
| 引用本文： | 于舒怡,傅俊范.玉米纹枯病周期性脉冲Logistic模型研究[J].玉米科学,2011,19(3):141-144. |
| 作者姓名： | 于舒怡 傅俊范 |
| 作者单位： | 1. 沈阳农业大学植物保护学院,沈阳,110866 2. 沈阳农业大学理学院,沈阳,110866 3. 辽宁出入境检验检疫局,辽宁大连,116001 |
| 基金项目： | 国家“粮丰工程”项目“东北平原南部(辽宁)春玉米丰效技术集成研究与示范”(2006BAD02A12) |
| 摘 要： | 以郑单958、辽单565和丹玉39为试材接种玉米纹枯病菌,对玉米纹枯病的流行动态进行系统调查,应用SPSS11.5软件将3年数据进行分析拟合。结果表明,与Logistic模型相比,脉冲Logistic模型可更直观、明确地反映年度间玉米纹枯病的周期性流行动态情况且符合该病发展的生物学意义;通过脉冲Logistic模型可以发现,年度间同一品种玉米纹枯病的最大病情指数(KN)和初始病情指数(dN)存在较大差异,表观侵染速率(rN)的差异较小;经Lo-gistic模型推导,明确沈阳地区玉米纹枯病指数增长期为玉米出苗至7月上旬,逻辑斯蒂增长期为7月上旬到8月末或9月初,衰退期为8月末或9月初到玉米生育后期。 |
| 关 键 词： | 玉米纹枯病 周期性 脉冲 Logistic模型 流行时期 |
| 收稿时间： | 2010/10/21 0:00:00 |
Study on Impulsive Logistic Model with Periodicity for Corn Sheath Blight |
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| YU Shu-yi,FU Jun-fan,LI Hai-chun,XUE Teng,ZHOU Ru-jun,KANG Xiao-jun.Study on Impulsive Logistic Model with Periodicity for Corn Sheath Blight[J].Journal of Maize Sciences,2011,19(3):141-144. | |
| Authors: | YU Shu-yi FU Jun-fan LI Hai-chun XUE Teng ZHOU Ru-jun KANG Xiao-jun |
| Institution: | YU Shu-yi1,FU Jun-fan1,LI Hai-chun2,XUE Teng3,ZHOU Ru-jun1,KANG Xiao-jun1(1.College of Plant Protection,Shenyang Agricultural University,Shenyang 110866,2.College of Science,3.Liaoning Entry-Exit Inspection and Quarantine Bureau of China,Dalian 116001,China) |
| Abstract: | The physiological race of Exserohilum turcicum was identified among 113 isolates collected from 28 areas of Liaoning, Jilin and Heilongjiang provinces in 2009 on maize inbred lines with Ht1, Ht2, Ht3 and HtN resistance genes, and its population dynamics was investigated. The results showed that 12 races were identified among these fungal isolates, including 0, 1, 2, 3, N, 12, 13, 1N, 2N, 123, 12N and 123N. Those races can not only infect the maize with single Ht gene, but also that with all kinds of resistance gene, and it meant the race component was in pluralistic. Among these races population, races 0 and 1 were predominant with occurrence frequency of 47.8% and 19.5%. The virulence frequencies against genes Ht1, Ht2, Ht3 and HtN were 37.2%, 21.2%, 4.4% and 15.9%, respectively. The physiological differentiation of E. turcicum was obvious, and their distribution and inter-specific variability also became complex. The increasing epidemic of northern maize leaf blight in northeastern China was ascribed to the increasing virulence frequencies of such major races as 0 and 1, and the resistance losing of the cultivars. |
| Keywords: | Corn sheath blight Periodicity Impulse Logistic model Epidemic phase |
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